Add comprehensive testing suite and fix QC issues

- Add 115+ unit, component, and E2E tests
- Add Vitest configuration with coverage thresholds
- Add validation schema tests (validations.test.ts)
- Add sanitizer utility tests (sanitizer.test.ts)
- Add WhatsApp service tests (whatsapp.test.ts)
- Add component tests for UnifiedTypography and UnifiedSurface
- Add E2E tests for admin auth and public pages
- Add testing documentation (docs/TESTING.md)
- Add sanitizer and WhatsApp utilities
- Add centralized validation schemas
- Refactor state management (admin/public separation)
- Fix security issues (OTP via POST, session password validation)
- Update AGENTS.md with testing guidelines

Test Coverage: 50%+ target achieved
All tests passing: 115/115

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

__tests__/setup.ts

@@ -2,6 +2,33 @@ import '@testing-library/jest-dom';
 import { server } from './mocks/server';
 import { beforeAll, afterEach, afterAll } from 'vitest';
 
+// MSW server setup for API mocking
 beforeAll(() => server.listen({ onUnhandledRequest: 'bypass' }));
 afterEach(() => server.resetHandlers());
 afterAll(() => server.close());
+
+// Mock window.matchMedia for Mantine components
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: vi.fn().mockImplementation((query) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});
+
+// Mock IntersectionObserver for Mantine components
+global.IntersectionObserver = class IntersectionObserver {
+  constructor() {}
+  disconnect() {}
+  observe() {}
+  takeRecords() {
+    return [];
+  }
+  unobserve() {}
+} as any;